Thor — the latest Marvel Studios superhero opus starring Chris Hemsworth, Natalie Portman and Anthony Hopkins — opens May 6 and holds the distinction of being the summer movie season’s first major release. But Sega’s official videogame tie-in — Thor: God of Thunder — hits stores three days earlier, and instead of being a traditional adaptation of the film, it tells an original story that has the hammer-wielding mythic hero battling trolls, frost giants, and fire gods in a number of mystical realms. In an intriguing twist, the story requires that Thor partner with a character that often serves as his arch-enemy in the comics, mischief-making god Loki, played by Tom Hiddleston in the movie. Might the game serve as a kind of prologue to the film? Methinks we’ll have to play it to find out! Hemsworth and Hiddleston voiced their characters in the game; check out this exclusive behind the scenes video of the actors at work. WARNING! Prepared to have the phrase “FEEL THE BITE OF WINTER!” thundering in your head all day.